| Non-abrasive |
soft |
Soft shales, clays, soft sandstone, gypsum, loose gravels, and silts |
|
 |
| medium |
Medium to hard shales, hard sandstones, and medium limestones |
|
| hard |
Hard limestones, dolomite, hard highly cemented sandstones, and granite |
|
| special |
Very hard limestones, dolomites, and granites, quartz, andecite and andecite-basalts |
|
| Abrasive |
soft |
Soft semi abrasive sandstones, soft semi abrasive shales, unconsolidated overburdens, and silicifed siltstones |
|
| medium |
Semi abrasive medium hard sandstones, limestones, unconsolidated medium hard coal overburden, medium porphry copper, basalt, chert, and other formations with silicious properties |
|
| hard |
Hard unconsolidated gold formations, hard silicious limestones, quartz, taconite, granite, dolomite, chert, porphry copper, and other formations that have high silica and quartz content |
|
| special |
Very hard cemented iron formations, hematite, specular hematite, magnitite, gold formations, abrasive iron ore, marblized limestone, and flint |
|
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